Improvement in apparatus for mitering printers  rules



UNITED STATES PATENT OEEICE.

G. H. BABOOOK, OF NEV YORK, N. Y.

IMPROVEMENT IN APPARATUS FOR IVIITERING PRINTERS RULES.

Specification forming part of Letters Patent No. 3 |392, dated February5, 1861.

To all whom t may concern.-

Be it known that I, G. H. Birnceck, of the city, county, and State ofNew York, have invented an Improved Apparatus for Mitering Printers7Rules, and I do hereby declare that the following is a full, clear, andexact description of the same, reference being had to the accompanyingdrawings, in. which- Figure l. is a perspective View o1 the machine, andFig. 2 is a side elevation.

Similar letters of reference indicate like parts in all the gures.

The 'nature of my invention consists n conibining an adjustablehardenedsteel templet for guiding the tile used in beveling the rule,with a vise for holding the rule while undergoing the operation, wherebyI cause the rule to be mitered to a perfect joint at any angle desired,and render the machine very simple, compact, and convenient. l

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation by the aid of thedrawings.

Upon a casting, A, which is to be screwed to a bench or other propersupport, a bed, a, is planed at an angle of about forty-five degrecswith the base, having a raised edge or guide, a, for the purpose otholding the rule square and true. The bed a forms onejawof the vise.

Near the bottom ofthe bed a, upon one side, is hinged the movable jaw B,which is operated by a screw, O, and a spring, O, placed in any properposition. The upper end, b, of the jaw B is thin and flat, and reachesnearly to the top ofthe bed a, the two forming a vise for holding therule rigidly while being mitered, whereby a true bevel is secured. \Verenot the rule thus firmly held it would be liable to move during theoperation ,and thus destroy the accuracy of the work.

Upon the side ofthe casting A is placed an l,

adjust-able segment, D, rnily held by being fitted into a recess and bythe screw E, but so mounted that it :may be adjusted upon A by looseningthe screw E. To D is rigidly iiXed a ilat plate of hardened steel, F,extending over the vise a B, but with a slot, j', ininiediately over thejaws thereof. This plate or templet F may be adjusted to any requiredangle with the bed a by means of the segment D and screw E. The face ofD is graduated to the various angles required for the regular polygons,each ot' which is designated by the numeral expressing the number ofsides in the polygon. This arrangement saves all calculating of angles;but D may be divid ed into degrees, if preferred. A slotted gage, G,held in place by a screw, g, is attached. to the bed a for use whenseveral short rules are to be mitered to the same length, but for longerrules this is removed.

The operation is as follows: rl`he figure designating the angle requiredis brought in eenjunction with a mark, In, on the casting A, andthesegment D clamped firm by the screw E. rIhe rule to be niitered isthen placed in the vise a b with its edge in contact with the guide a',and rmlyclamped by turning screw C, with its end projecting through theslot f in the templet F. A iile is now applied to the end of the ruleparallel to F until its further action is arrested by the templet, whichis too hard to be acted upon by the file, when the rule is beveled tothe angle required.

I am aware that hardened-steel templets for guiding a iile are not new,and one placed permanently at an angle of forty-five degrees has beenused for Initering printers7 rules at that angle; but I am not awarethat one has been made adjust-able or used in combination with a vise,as above described, and

That I therefore claim as my invention, and desire to secure by LettersPatent, is-

rIhe combination of an adjustable steel templet with a vise or theirequivalents, con structed and operating substantially in the manner andfor the purpose above described.

In testimony whereoi I have hereunto set my name in presence of twosubscribing witnesses.

G. H. BABOOOK.

fitness es:

Tnonas D. S'rnrsox, Wn. B. SMITH.

